Blue supergiants as descendants of magnetic main sequence stars

Blue supergiants as descendants of magnetic main sequence stars
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蓝超巨星是磁性主序星的后代

DOI:
10.1051/0004-6361/201526302
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发表时间:
2015
期刊:
arXiv: Solar and Stellar Astrophysics
影响因子:
--
通讯作者:
Fossati L
Fossati L
中科院分区:
--
文献类型:
--
作者:
Petermann I;Langer N;Castro N;Fossati L

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最近发现大约10%的大质量主序星具有强大的大规模磁场。这两个领域的起源和进化结果在很大程度上是未知的。我们认为,这些领域可能是足够强大的内部深处的恒星,以抑制其对流核心的外缘附近的对流。我们进行了参数化的恒星演化计算,并假设从零年龄主序到核心碳耗尽,质量范围为16 M <$-28 M <$的恒星的对流核心尺寸减小。我们发现,这样的模型避免了最冷的一部分的主要序列带,这通常是充满了进化模型,包括对流核心超调。此外,我们的“磁性”模型在核心氦燃烧期间填充了蓝超巨星区域,即,普通单颗星星模型留下的主序后间隙,其中一些在Hertzsprung-Russell图中靠近超新星1987 A祖先的位置结束了它们的生命。进一步的影响包括在红超巨星阶段光度的强烈降低,以及白色矮星和中子星星形成的极限初始质量的向下移动。
About 10% of the massive main sequence stars have recently been found to host a strong, large scale magnetic field. Both, the origin and the evolutionary consequences of these fields are largely unknown. We argue that these fields may be sufficiently strong in the deep interior of the stars to suppress convection near the outer edge of their convective core. We performed parametrised stellar evolution calculations and assumed a reduced size of the convective core for stars in the mass range 16M⊙to 28M⊙from the zero age main sequence until core carbon depletion. We find that such models avoid the coolest part of the main sequence band, which is usually filled by evolutionary models that include convective core overshooting. Furthermore, our “magnetic” models populate the blue supergiant region during core helium burning, i.e., the post-main sequence gap left by ordinary single star models, and some of them end their life in a position near that of the progenitor of Supernova 1987A in the Hertzsprung-Russell diagram. Further effects include a strongly reduced luminosity during the red supergiant stage, and downward shift of the limiting initial mass for white dwarf and neutron star formation.
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